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The ses lite needs voltage and ground. Voltage goes hot when you turn the key on. The computer controls the ground circuit. I can't rule out, your instrument cluster may have a problem? The ground circuit could be shorted to ground before it reaches the computer. Or the computer has a problem? Just my opinion.

So on 1/10/2005 we took the Vue in, and they did the following:
date: 1/10/2005
"CUSTOMER STATES THE SES LIGHT IS ON"
CAUSE: UNKNOWN
TECH COMM: SES LIGHT IS ON. FOUND FUEL TRIM LEAN CODE P0171 & P0174. RETORQUE INTAKE VACUUM CHAMBER BOLTS AND INSTALL VACUUM CHAMBER SPRINGS PER BULLETIN02/06/01/016A

even a dealer can make a simple mistake, But since you had the car done there I would take it back and ask them to re-clear the code, if there is a problem it will pop up again, since they guaranty their work,, if it does,, have them fix the problem

P0440 code is EVAP control system problem.This has to do with emissions from the carbon can, fuel tank and general leaks that come from fuel evaporation. Anywhere gas fumes can escape the systerm. This code is very common and can be caused by a simple fuel cap being loose or leaking. Check the fuel cap and reset the coputer. If the SES light comes back on there could be a problem with some of the systerm controls. ie vent valve,purge valveand canister. And /or vac leaks.